Đọc kĩ đoạn văn rồi chọn từ/ cụm từ thích hợp nhất trong số các gợi ý A,B,C, hoặc D để hoàn tất mỗi trong số các câu theo sau

The Chinese white Dolphin is an extremely beautiful creature. This type of dolphin was first noticed by Per Osbeck in 1757. He described snow-white dolphins at play in the Pearl River Delta in China. No dolphins, however, have been seen in this area since 1972. The dolphins have, instead, moved to waters north of Lantau Island in Hong Kong. Chinese White Dolphins are about the same size and shape as bottlenose dolphins (the type that can be seen at Ocean park). Their colouring, however, is very different, ranging from pure white in Chinese waters, to pink and grey elsewhere. In fact, Chinese fishermen call them "white ghosts", and traditionally believe them to be reincarnations of fishermen lost at sea. Very little is known about these animals. Scientists are still debating which species the dolphins belong to. They are not sure if they are actually part of the same species found in waters around Indonesia and northern Australia, or if they are completely different subspecies that is found anywhere else in the world. Tragically, however, there may not be enough time for scientists to find the answer to this question, because the dolphins are in very great danger or becoming extinct. The main threat comes from the largest construction project in Hong Kong's history - the new airport on Chek Lap Kok Island off Lantau. The building work here involves massive use of explosives, and huge areas of the sea are being turned into land. Obviously, the destruction of this area is having a terrible effect on sea life. In addition, matters are made worse by the fact that the waters in the areas are also terribly polluted.

71. The Chinese White Dolphin was discovered ____.

A. in 1972 B. in Hong Kong C. in China D. on Lantau Island

72. Chinese White Dolphins now mainly live ____.

A. at Ocean Park B. in China C. near Lantau D. in Australia

73. The word "subspecies" in the passage describes a member of an animal group that is ____

A. a similar shape, size and colour to other types of animals

B. a different shape, size and colour to other types of animals.

C. completely different from other members of the species. D. slightly different from other types of the species.

74. Scientist are not sure if the dolphin is ____.

A. found in Australia and Indonesia. C. already extinct.

B. a subspecies unique to Kong Kong D. a subject worth talking about.

75. The building of the new airport is ____.

A. improving the quality of waters around Chek Lap island.

B. the largest construction project in the world history.